If you want new there's nothing wrong with that, but there's also nothing wrong with riding a used (properly inspected, good condition) steel frame of any vintage you're likely to find.

Google didn't turn up a Darby CL, and I don't know Pa. geography well enough to know what's near you. Found these with a quick search of the Philly CL:
http://philadelphia.craigslist.org/bik/2988799400.html
http://philadelphia.craigslist.org/bik/2920560510.html
The posters didn't list tubing spec or provide pictures that would should the details, and since it's not near me I didn't go hunting to find out.